Ключевые слова: channel, collector, concept, concrete, danger, dark, decay, deep, dirt, dirty, drain, drainage, draining, environment, factory, flooded, flow, flowing, industrial, inside, interior, leak, leakage, light, mud, mystery, outflow, passage, pipe, pipeline, pollution, reflection, river, round, sewage, sewer, sewerage, sludge, stink, stream, subterranean, system, toxic, tube, tunnel, underground, urban, waste, wastewater, water,